title: Analysis of organic compounds of water-in-crude oil emulsions separated by microwave heating using comprehensive two-dimensional gas chromatography and time-of-flight mass spectrometry.
abstract: In this work the higher peak capacity and resolution of comprehensive two-dimensional gas chromatography (GCxGC) has been successfully applied, for the first time, to tentatively identify several polar organic compounds of organic extracts of aqueous phases resulting from microwave demulsification process of water-in-crude oil emulsions. Results have shown that higher temperatures and longer exposure time to microwave irradiation produced water phases with a wider variety of polar organic compounds. The microwave process showed to be suitable for the extraction of several polar compounds classes of petroleum. The proposed microwave extraction method and GCxGC identification of polar compounds of petroleum samples are of practical interest for the petrochemical industry due to corrosion and related problems associated with these polar compounds in refinery equipments. The GCxGC/time-of-flight MS technique shows to be very important in the total separation of different classes of compounds and allows the identification of many compounds in these classes.
authors.affiliation: Universidade Tiradentes - UNIT, Instituto de Tecnologia e Pesquisa - ITP, Av. Murilo Dantas 300, Aracaju (SE), Brazil.
authors.forename: Lisiane S
authors.initials: LS
authors.lastname: Freitas
authors.forename: Carin
authors.initials: C
authors.lastname: Von Mühlen
authors.forename: Janaína H
authors.initials: JH
authors.lastname: Bortoluzzi
authors.forename: Claudia A
authors.initials: CA
authors.lastname: Zini
authors.forename: Montserrat
authors.initials: M
authors.lastname: Fortuny
authors.forename: Claudio
authors.initials: C
authors.lastname: Dariva
authors.forename: Raquel C C
authors.initials: RC
authors.lastname: Coutinho
authors.forename: Alexandre F
authors.initials: AF
authors.lastname: Santos
authors.forename: Elina B
authors.initials: EB
authors.lastname: Caramão
mesh_terms: D005591:Chemical Fractionation; D004655:Emulsions; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D006358:Hot Temperature; D008872:Microwaves; D009930:Organic Chemicals / Q000032:analysis* / Q000302:isolation & purification; D010578:Petroleum / Q000032:analysis*; D014867:Water / Q000032:analysis*
chemical_list: D004655:Emulsions; D009930:Organic Chemicals; D010578:Petroleum; D014867:Water